http://info.sonicretro.org/Sonic_2_XL <- Download
http://kotaku.com/5587100/brilliant-...morbid-obesity <- Kotaku, some vids
A fun little ol Sonic the Hedgehog 2 Genesis hack with a few alterations. Mainly, that rings are replaces with onion rings, and onion rings make you fatter. Getting fatter means you do not jump as high nor run as fast. Eventually, you'll be too fat to spin jump, and eventually even move at all! Fat can be burned off by running at top speed for a set frame of time, or by breaking ? monitors.
Only problems seem to be that you can get stuck in some areas and pits, unable to slim down nor jump high enough to escape. Otherwise, it's good Sonic fun.